Accidents happen.. If you had permission to be in the parade with your quad, and had permission to be doing wheelies, then in my eyes it's a simple mishap. A very dangerous one, but it was an accident. I do think though that whoever did give you permission (if you had it) to be riding like that when there is a big crowd around is a moron. So really, you prolly shouldnt have been out there doing it, but shit happens...
EDIT: Holy shit you made the news.